PLEASE! good Lord, there is nothing hard about smiling or saying hi back. My daughters love to have someone reply to them- it makes their day. When you don't, I explain to them that there are mean people in the world, but that they should STILL keep on smiling - you never know when it's what a person needs. Despite the aholes in the world, i'll still teach my girls to be good!
I did this in the early days of The Orange Rhino Challenge - got me to slowly change my habit!